/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * tools/csvparser.c
 *
 *   Copyright (C) 2011-2012 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>

#include "csvparser.h"

/****************************************************************************
 * Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Public Data
 ****************************************************************************/

static bool g_debug;
static char g_line[LINESIZE + 1];
static char g_parm[MAX_FIELDS][MAX_PARMSIZE];
static int g_lineno;

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Name: skip_space
 ****************************************************************************/

static char *skip_space(char *ptr)
{
	while (*ptr && isspace((int)*ptr))
		ptr++;
	return ptr;
}

/****************************************************************************
 * Name: copy_parm
 ****************************************************************************/

static char *copy_parm(char *src, char *dest)
{
	char *start = src;
	int i;

	/* De-quote the parameter and copy it into the parameter array */

	for (i = 0; i < MAX_PARMSIZE; i++) {
		if (*src == '"') {
			*dest = '\0';
			return src;
		} else if (*src == '\n' || *src == '\0') {
			fprintf(stderr, "%d: Unexpected end of line: \"%s\"\n", g_lineno, start);
			exit(4);
		} else
			*dest++ = *src++;
	}

	fprintf(stderr, "%d: Parameter too long: \"%s\"\n", g_lineno, start);
	exit(3);
}

/****************************************************************************
 * Name: find_parm
 ****************************************************************************/

static char *find_parm(char *ptr)
{
	char *start = ptr;

	if (*ptr != '"') {
		fprintf(stderr, "%d: I'm confused: \"%s\"\n", g_lineno, start);
		exit(5);
	}
	ptr++;

	ptr = skip_space(ptr);
	if (*ptr == '\n' || *ptr == '\0')
		return NULL;
	else if (*ptr != ',') {
		fprintf(stderr, "%d: Expected ',': \"%s\"\n", g_lineno, start);
		exit(6);
	}
	ptr++;

	ptr = skip_space(ptr);
	if (*ptr != '"') {
		fprintf(stderr, "%d: Expected \": \"%s\"\n", g_lineno, start);
		exit(7);
	}
	ptr++;

	return ptr;
}

/****************************************************************************
 * Public Functions
 ****************************************************************************/

/****************************************************************************
 * Name: set_debug
 ****************************************************************************/

void set_debug(bool debug)
{
	g_debug = debug;
}

/****************************************************************************
 * Name: get_parm
 ****************************************************************************/

char *get_parm(unsigned int field)
{
	if (field >= MAX_FIELDS) {
		return NULL;
	}

	return g_parm[field];
}

/****************************************************************************
 * Name: get_lineno
 ****************************************************************************/

int get_lineno(void)
{
	return g_lineno;
}

/****************************************************************************
 * Name: get_line
 ****************************************************************************/

char *get_line(void)
{
	return g_line;
}

/****************************************************************************
 * Name: read_line
 ****************************************************************************/

char *read_line(FILE * stream)
{
	char *ptr;

	for (;;) {
		g_line[LINESIZE] = '\0';
		if (!fgets(g_line, LINESIZE, stream))
			return NULL;
		else {
			g_lineno++;
			if (g_debug)
				printf("Line: %s\n", g_line);

			ptr = skip_space(g_line);
			if (*ptr && *ptr != '#' && *ptr != '\n')
				return ptr;
		}
	}
}

/****************************************************************************
 * Name: parse_csvline
 ****************************************************************************/

int parse_csvline(char *ptr)
{
	int nparms;
	int i;

	/* Format "arg1","arg2","arg3",... Spaces will be tolerated outside of the
	 * quotes.  Any initial spaces have already been skipped so the first thing
	 * should be '"'.
	 */

	if (*ptr != '"') {
		fprintf(stderr, "%d: Bad line: \"%s\"\n", g_lineno, g_line);
		exit(2);
	}

	ptr++;
	nparms = 0;

	/* Copy each comma-separated value in an array (stripping quotes from each
	 * of the values).
	 */

	do {
		if (nparms >= MAX_FIELDS) {
			fprintf(stderr, "%d: too many Parameters: \"%s\"\n", g_lineno, g_line);
			exit(8);
		}
		ptr = copy_parm(ptr, &g_parm[nparms][0]);
		nparms++;
		ptr = find_parm(ptr);
	} while (ptr);

	/* If debug is enabled, show what we got */

	if (g_debug) {
		printf("Parameters: %d\n", nparms);
		for (i = 0; i < nparms; i++)
			printf("  Parm%d: \"%s\"\n", i + 1, g_parm[i]);
	}

	return nparms;
}
